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Membrane Transport. Biochemistry Free For All. Chemical and Electrical Potential Across a Lipid Bilayer Barrier. Osmotic Pressure Across a Semipermeable Barrier. Types of Membrane Proteins. Three Types of Membrane Protein Ports. Symport (Synport). Uniport. Antiport.
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Membrane Transport Biochemistry Free For All
Chemical and Electrical Potential Across a Lipid Bilayer Barrier
Three Types of Membrane Protein Ports Symport (Synport) Uniport Antiport
No Net Change in Charge Net Change in Charge
Ion Channel Features 1. General Structure 2. Opening 3. Filter 4. Effective Opening Size 5. Door
Closed Open Potassium Channel
Cellular Transport Types Passive - Purely Diffusion Driven, Follows Concentration Gradient Facilitated - Protein Guided, Follows Concentration Gradient Active - Protein Guided, Energy Required to Move at Least One Molecule Against Concentration Gradient
Higher K+ inside Higher Na+ outside Sodium-Potassium ATPase
Secondary Energy Source Sodium-Glucose Pump Sodium/Glucose Symport
Lactose Permease Lactose/Proton Symport
Lactose Permease Secondary Energy Source - Protons
Nerve Cell Transmission 1. Stimulus 2. Opening of Na+ gates 3. Na+ diffuses into cell 4. Voltage change causes K+ gates to open 5. K+ diffuses out of cell 6. All gates close 7. Wave of voltage changes moves down cell 8. Neurotransmitters move signal across cells 9. Na+ K+ ATPase restores gradients in originating cell
K+ gates open Action Potential Na+K+ ATPase acts Stimulus, Na+ gates open
Gates Gates Wave of Na+ in, K+ out Transmission of signal from one cell to another
Tetrodotoxin From Puffer Fish Bind Voltage Gated Na+ Channels
Saxitoxin Shellfish Toxin From Algal Blooms Sodium Channel Blocker